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Traffic parameters including vehicle flow and vehicle speed can be acquired through video recording-manual acquisition method. In this paper, fundamental principle of cell transmission model is introduced, which should be established based on the relationship between length of vehicle queue and actual traffic capacity of the cross section on which a traffic accident occurs, duration of the accident and vehicle flow on upstream road section, based on which EXCEL can be used for processing and obtaining an equinumerous graph for length of vehicle queue on corresponding section. Such equinumerous graph is a dynamic model changing with time, which can reflect the relationship between length of vehicle queue and three other variables. Finally, MATLAB can be used to establish a graph of spatial relationship between length of vehicle queue and three other variables.

Analysis on Impact of Traffic Accident on Length of Vehicle Queue Based on Cell Transmission Model